Hylander Posted August 4, 2014 Share Posted August 4, 2014 John , you have given me an idea for Christmas. Can I ask for a link to the App please? Quote Link to comment Share on other sites More sharing options...
BroadScot Posted August 4, 2014 Share Posted August 4, 2014 John , you have given me an idea for Christmas. Can I ask for a link to the App please? Yup it would certainly speed up Santas journey through the night Iain. 1 Quote Link to comment Share on other sites More sharing options...
Hylander Posted August 4, 2014 Share Posted August 4, 2014 Strowager , can I have a link to your gadget as well. I looked up a similar version at it was over £4,000. Need to go and lie down if it that expensive. Quote Link to comment Share on other sites More sharing options...
Hockham Admiral Posted August 4, 2014 Author Share Posted August 4, 2014 John , you have given me an idea for Christmas. Can I ask for a link to the App please? There are lots of them! https://play.google.com/store/search?q=android%20speedometer&c=apps Quote Link to comment Share on other sites More sharing options...
Guest Posted August 4, 2014 Share Posted August 4, 2014 Is there an "Hours per gallon" measurer one can get? if so is it hideously expensive? New marine electronics are being introduced all the time, so I may be out of date with my understanding, but when I bought that, the only type available was chartplotters with the accessory add on "fuel flow sensors". At that time they only worked for petrol, because diesels have spill pipes that return fuel to the tank and would give a false reading. The flow sensor add on was a Navman 2100 that was compatible with my Northstar 657 plotter. I was trying to google the price of it and I came across an interesting discussion on them on a US boating forum: http://www.thehulltruth.com/boating-forum/21608-navman-2100-fuel-flow-meter.html Strowager , can I have a link to your gadget as well. I looked up a similar version at it was over £4,000. Need to go and lie down if it that expensive. I quite agree Hylander, I'd expect to get a boat for that much dosh. My Navstar chartplotter/GPS/depthfinder was about £300 with the fuel sensor, but that was about 6 years ago, and I don't know what the latest equivalents are, but I would imagine around the same price, as this sort of thing gets slightly cheaper, like TVs, phones and computers. Here's a link to my gear, described as "legacy" products now ! http://www.navmanmarine.net/navman-chartplotters.html Quote Link to comment Share on other sites More sharing options...
finny Posted August 4, 2014 Share Posted August 4, 2014 :party2:Ha ha ......sorry folks but you are all getting it wrong ....switch off the techy stuff .....fill up when nearly empty ....slow down and chill ......and best of all Enjoy Finny 1 Quote Link to comment Share on other sites More sharing options...
Guest Posted August 5, 2014 Share Posted August 5, 2014 :party2:Ha ha ......sorry folks but you are all getting it wrong ....switch off the techy stuff .....fill up when nearly empty ....slow down and chill ......and best of all Enjoy Finny I can appreciate both schools of thought on technology Finny. I like a few toys, but then so much other stuff comes along and I then retreat to the background myself. I was the first in with computers, mobile phones, and GPS's, but the relentless evolution to get maximum consumer spending quickly gets me to saturation level. Despite my veneer of high tec stuff, I'm still basically a muck and bullets man. Quote Link to comment Share on other sites More sharing options...
ranworthbreeze Posted August 5, 2014 Share Posted August 5, 2014 Hi Strowager, So you had a mobile brick as well, I still have mine somewhere a Phillips complete with a mag mount aerial. Our first computer was a BBC with a Torch dual floppy 5 1/4 inch drive, happy but slow computing times. Regards Alan Quote Link to comment Share on other sites More sharing options...
Guest Posted August 5, 2014 Share Posted August 5, 2014 Hi Strowager, So you had a mobile brick as well, I still have mine somewhere a Phillips complete with a mag mount aerial. Our first computer was a BBC with a Torch dual floppy 5 1/4 inch drive, happy but slow computing times. Regards Alan Yes, I definitely have the tea shirt as well there Alan. I had a Motorola "brick" back in the analogue days when the Voda line rental alone was £17 a month, and calls at 50p min. I had a dedicated carphone as well, "cloned" onto the same number, and had to remember to never switch both on at the same time. My PC evolution was ZX81 - Spectrum - BBC - Amstrad PC - then PC clones. At work I started off with CPM machines, an RM380Z, then a "Hinet" networked system. The hard disk in it was an 8" winchester, with the enormous capacity (then) of 20 Megabytes, (yes mBytes), and that alone cost £800, back in the 1980's. Strange to think that you can now buy a 128 Gigabyte USB pen for about £30. (Which has two thousand five hundred times as much storage capacity, and fits in a top pocket)..... Quote Link to comment Share on other sites More sharing options...
BroadScot Posted August 5, 2014 Share Posted August 5, 2014 I had one of those Nokia Vodaphone thingies, you got a bargain, mine cost £20 a month but 30mins free time! As said, oh how times have changed. Iain. Quote Link to comment Share on other sites More sharing options...
ExUserGone Posted August 5, 2014 Share Posted August 5, 2014 Tha fact remains though, that "speed over ground" is directly proportional to how much damage a moving boat will inflict on a moored boat or stationary riverside structure. Back on this old chesnut, yes I admit a slow collision will do less damage and injury than a fast collision will, but the boat thats moving at a speed that gives good control will not have the collision in the first place so reducing the damage and injury to zero, obviously enforcement is very hard to do in knots (if not almost impossible). Back on the gt.ouse I once had an EA patrol boat coming towards me with a radar gun shouting at me to slow down, I had to laugh at them as they must have clocked me at twice the speed. Have also seen BA patrol boats mooring at reedham only to be spun straight round as they did it the wrong way for the tide. Quote Link to comment Share on other sites More sharing options...
SPEEDTRIPLE Posted August 5, 2014 Share Posted August 5, 2014 Personally, i think this will only lead to on the spot fines, and other such rubbish. The police set a precedent with their gatso cameras (now no longer usable due to PROVED inacurracy readings), and the BA will only follow suit. On the road, speed is always a constant on stationary tarmac which is what you`re travelling on, whereas the only constant on a river is tidal movement, which can also be affected by climate conditions. Therefore, you`ll never get an accurate reading. Add to that the operator being in a moving boat, and hey presto, lots of revinue for the BA to spend on yet more manufactured jobs for university students. Keep speed cameras off the broads i say, and go back to having rangers do what they were originally there for, and that`s patrolling the rivers properly. Quote Link to comment Share on other sites More sharing options...
650xs Posted August 5, 2014 Share Posted August 5, 2014 flatt out and full throttle on the broads i say get them ole banks wider and wash a waffie up and down for a change ....!!!!! drive it like yer stole it .........................!!!!! Quote Link to comment Share on other sites More sharing options...
Guest Posted August 5, 2014 Share Posted August 5, 2014 We seem to have gone round in a circle with this thread. The pertinent points remain. The BA has to have a workable method to be able to prosecute blatant speeders or there will be an increase in boats going faster and faster and getting away without being able to be prosecuted. The only practical way to maximise BA Ranger's time in monitoring speed appears to be by the use of static radar guns. Since toll payers are paying their wages, it's in all our interests for the task to be carried out as efficiently and effectively as possible. If anyone can suggest a practical alternative method to radar guns for proving excessive speed that will stand up in court, I'm sure the BA would be very grateful to hear it. Quote Link to comment Share on other sites More sharing options...
BroadAmbition Posted August 5, 2014 Share Posted August 5, 2014 Confused - Using your formula I get a max hull speed of 8:6 However I have seen more than that (using GPS) on flat calm waters at slack water Quote Link to comment Share on other sites More sharing options...
Guest Posted August 6, 2014 Share Posted August 6, 2014 Confused - Using your formula I get a max hull speed of 8:6 However I have seen more than that (using GPS) on flat calm waters at slack water The formula is for true displacement hulls only. If you can get appreciably more speed than the theoretical maximum, then you may have a planing or semi-displacment hull design instead. They can exceed displacement speeds but with a huge wash till they accelerate through the transition stage and rise up over "the hump" and truly plane, at about 16 to 20 knots. What make and model is your hull, and what horsepower is you engine ? Quote Link to comment Share on other sites More sharing options...
Guest Posted August 6, 2014 Share Posted August 6, 2014 Another thought.... Where you've said you've seen "more than 8.6", was that knots, or mph ? 8.6 knots is 9.9 mph. Quote Link to comment Share on other sites More sharing options...
10B Posted August 6, 2014 Share Posted August 6, 2014 Confused - Using your formula I get a max hull speed of 8:6 However I have seen more than that (using GPS) on flat calm waters at slack water And that was through Horning!! Quote Link to comment Share on other sites More sharing options...
BroadAmbition Posted August 7, 2014 Share Posted August 7, 2014 Er of course it wasn't through horning !! The GPS displays in mph The make is a Jack Powles 40 (Aka Star Supreme class and/or Bourne 40 hull) Engine is 50hp shaft drive with a 4 x blade prop Quote Link to comment Share on other sites More sharing options...
Guest Posted August 7, 2014 Share Posted August 7, 2014 Er of course it wasn't through horning !! The GPS displays in mph The make is a Jack Powles 40 (Aka Star Supreme class and/or Bourne 40 hull) Engine is 50hp shaft drive with a 4 x blade prop Assuming a watereline length of about 38ft, the 1.4 constant gives you a maximum displacement hull speed of 8.6 knots, as you had calculated. This is when your bow wave trough reaches the stern, and your boat starts to tilt backwards, trying to climb over it's own bow wave. This converts to 9.9 mph. The 50 hp engine, well propped, is ample for that size of hull at displacement speed, so you could push further into the "transition" phase, but with a greatly increased wash and much reduced fuel economy. How much faster than 9.9mph was showing on the GPS ? Quote Link to comment Share on other sites More sharing options...
BroadAmbition Posted August 7, 2014 Share Posted August 7, 2014 9:9mph is about right - Thanks for your advice Quote Link to comment Share on other sites More sharing options...
Hockham Admiral Posted August 7, 2014 Author Share Posted August 7, 2014 We seem to have gone round in a circle with this thread. Errr, I thought it was about throttle versus fuel consumption, Strow? Quote Link to comment Share on other sites More sharing options...
Guest Posted August 7, 2014 Share Posted August 7, 2014 Errr, I thought it was about throttle versus fuel consumption, Strow? Quite true John. What I meant was that it then widened into how to monitor one's speed, then went off at a tangent into a BA knocking session about radar guns (twice). Quote Link to comment Share on other sites More sharing options...
JennyMorgan Posted August 7, 2014 Share Posted August 7, 2014 I understand, from an authoritative source, that fixed notice penalties are NOT just around the corner. Apparently it's accepted that it would destroy the generally good relationship between the Rangers and the Rhond Dwellers. In this instance I tend to believe the horse's mouth on this one. Quote Link to comment Share on other sites More sharing options...
Warp Posted August 7, 2014 Share Posted August 7, 2014 Attached is a chart of hull speeds mapped to mph. If you locate your waterline length on the bottom and scan up then green lines should roughly correspond to low wash and red ones to high wash. Hull speed is not an absolute limit as canoes surfboards dinghies etc regularly prove. It just means that you are moving into a planning mode (loads of boats can exceed their hull speed even sailing boats). HullSpeeds.pdf 1 Quote Link to comment Share on other sites More sharing options...
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